CN101877381A - Light emitting device and light emitting device package - Google Patents
Light emitting device and light emitting device package Download PDFInfo
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- CN101877381A CN101877381A CN2010101691367A CN201010169136A CN101877381A CN 101877381 A CN101877381 A CN 101877381A CN 2010101691367 A CN2010101691367 A CN 2010101691367A CN 201010169136 A CN201010169136 A CN 201010169136A CN 101877381 A CN101877381 A CN 101877381A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/08—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
- H01L33/46—Reflective coating, e.g. dielectric Bragg reflector
- H01L33/465—Reflective coating, e.g. dielectric Bragg reflector with a resonant cavity structure
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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Abstract
The invention provides a Light emitting device and light emitting device package. The light emitting device (LED) (100) includes a light emitting structure and a reflective layer (150). The light emitting structure includes a semiconductor layer (110) of a first conductivity type, a light emitting layer (120), and a semiconductor layer (130) of a second conductivity type, and the reflective layer (150) is provided adjacent to the semiconductor layer of the second conductivity-type. The light emitting layer includes multiple quantum wells, and a distance between adjacent quantum wells is about Lambada/2n +-Delta , where Lambada represents a wavelength of emitted light, n represents an average refractive index of a medium disposed between the reflective layer and the light emitting layer, and Delta<=Lambada/8n.
Description
Technical field
One or more embodiment as herein described relates to luminous.
Background technology
Luminescent device (LED) is used to comprise the various purposes of image generation.A factor that influences these devices generation light is an internal quantum.A kind of approach that improves internal quantum comprises with stacked structure growing high quality film.Another kind of approach is attempted to control by geometry and is improved luminous efficiency.Yet, proved that these and other approach has weak point.
Summary of the invention
The present invention relates to luminescent device as described below, luminescent device encapsulation and illuminator.
1. a luminescent device (LED) comprising:
Ray structure, described ray structure comprise first conductive-type semiconductor layer, luminescent layer and second conductive-type semiconductor layer; With
Reflector, described reflector are set in abutting connection with described second conductive-type semiconductor layer,
Wherein said luminescent layer comprises a plurality of quantum well, and
Distance between the adjacent quantum well is that (wherein λ represents radiative wavelength to λ/2n ± Δ, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, and Δ≤λ/8n.)
2. according to 1 described LED, wherein said reflector and the distance between the most described quantum well in contiguous described reflector make by between the light of described luminescent layer emission and the light constructive interference taking place by described reflective layer reflects.
3. according to 2 described LED, wherein said reflector and the distance between the most described quantum well in contiguous described reflector be that (wherein the m representative is greater than zero constant for (2m+1) (λ/4n)-2 α ± Δ), λ represents described radiative wavelength, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, α represents the depth of penetration of light in described reflector, and Δ≤λ/8n.)
4. a luminescent device (LED) comprising:
Ray structure, described ray structure comprise first conductive-type semiconductor layer, comprise the luminescent layer and second conductive-type semiconductor layer of a plurality of quantum well; With
Reflector on described ray structure,
Wherein said reflector and the distance between the most described quantum well in contiguous described reflector make by between the light of described luminescent layer emission and the light constructive interference taking place by described reflective layer reflects.
5. according to 4 described LED, wherein said reflector and the distance between the most described quantum well in contiguous described reflector be that (wherein the m representative is greater than zero constant for (2m+1) (λ/4n)-2 α ± Δ), λ represents described radiative wavelength, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, α represents the depth of penetration of light in described reflector, and Δ≤λ/8n.)
6. a luminescent device (LED) comprising:
Ray structure, described ray structure comprise first conductive-type semiconductor layer, comprise the luminescent layer and second conductive-type semiconductor layer of a plurality of quantum well that form by a plurality of trap layers and a plurality of barrier layer; And
In abutting connection with the reflector of described ray structure,
The gross thickness of barrier layer that wherein adjoins each other and trap layer is that (wherein λ represents radiative wavelength to λ/2n ± Δ, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, and Δ≤λ/8n.)
7. luminescent device encapsulation comprises according to 1 described luminescent device, and comprises and be provided as the packaging body that holds described luminescent device.
8. an illuminator comprises light emitting module portion, and described light emitting module portion comprises according to 7 described luminescent devices encapsulation.
Description of drawings
Fig. 1 is the figure that shows an embodiment of luminescent device.
Fig. 2 is the figure of the luminescent layer among the LED of displayed map 1.
Fig. 3 is the light extraction efficiency figure of the LED of Fig. 1 and 2.
Fig. 4 is the figure that shows an embodiment of LED encapsulation.
Embodiment
Fig. 1 shows the sectional view of an embodiment of luminescent device (LED), and Fig. 2 shows the enlarged drawing of the luminescent layer of this device.This LED comprises: second conductive-type semiconductor layer 130 on the second electrode lay 140 on reflector 150, the reflector, the second electrode lay, the luminescent layer that comprises a plurality of coherent quantum traps 120 on the semiconductor layer 130 and first conductive-type semiconductor layer 110 on the luminescent layer.First electrode 160 is arranged on the semiconductor layer 110.
According to an embodiment, can regulate or set the light extraction efficiency of distance between a plurality of coherent quantum traps to obtain to be scheduled to or to improve.This can realize by the luminous pattern regulating action in the luminescent layer 120, hereinafter will be explained in more detail this.
When the reflector with high reflectance be arranged at luminescent layer around or when contiguous, can regulate or set the characteristic of luminescent layer based on the distance between luminescent layer and the reflector.For example, in the time of in eelctric dipole is arranged on the single dielectric space that does not wherein comprise the reflector, the maximum point of luminous pattern distributes perpendicular to direction of vibration.
Yet when the reflector with high reflectance is arranged on around the eelctric dipole or when contiguous, the characteristics of luminescence is different, for example, light can be concentrated in vertical direction, and this depends on for example distance between the eelctric dipole and reflector; Perhaps light can advance along the surface in reflector.If with the distance setting between reflector and the luminescent layer is to make the light from each quantum well mainly have the vertical direction component, then can improve the light extraction efficiency of LED.
The pattern of luminescent layer can be based on from the interference effect that takes place between the light of luminescent layer and the light from the reflector and regulate by the reflector.When around luminescent layer, the reflector not being set, perhaps enough big thereby can ignore interference effect the time when the distance between reflector and the luminescent layer, can approach on all directions, all to have the spherical wave of identical or basic identical coefficient so from the light of luminescent layer.
Yet, when providing the reflector, can regulate luminescent layer to produce the luminous pattern of expecting and can produce constructive interference, so that light concentrates on the direction of vertical direction or other expectation.When it is applied to vertical-type LED, can regulate or set the quantum well of luminescent layer 120 and the distance between the reflector 150 based on for example thickness of second conductive-type semiconductor layer 130.
Fig. 3 shows an example of the light extraction efficiency that can obtain by cause luminous pattern to change based on the distance between reflector and the luminescent layer.Regulate the reflector (for example, tin indium oxide (ITO)) of the second electrode lay and the distance between the luminescent layer by 3-D finite difference time domain (FDTD) simulation, with the increment of mathematical computations with the light extraction efficiency of luminous pattern variation.
Luminescent layer can comprise eelctric dipole, and wherein the polarization on x, y and the z direction mixes at random mutually.When observing the incremental result of light extraction efficiency, as can be seen, maximum point of light extraction efficiency (constructive interference) and smallest point (destructive interference) alternately occurred with the cycle of about λ/4n.This is to show the evidence of regulating luminous pattern by the interference of light.
In fact, when when the maximum point of light extraction efficiency and smallest point are observed luminous pattern,, launch high light in vertical direction at the maximum point place.On the contrary, at the smallest point place, there is the light of relatively small amount in vertical direction.In the case, nearly all light is all with the inclination angle emission greater than the critical angle of light total reflection.
Regulating luminous pattern by the reflector shows based on the estimated result that approaches quantum well.Make luminescent layer have thickness if the number of quantum well is increased to greater than about λ/2n, then can reduce or even eliminate the luminous pattern regulating action, for example constructive interference condition and destructive interference condition are mixed mutually, thereby cause average luminous pattern.Because the luminous pattern regulating action, the number of quantum well should be reduced, and the thickness of luminescent layer should be less than about λ/2n.
Yet when reducing the number of quantum well, the limited probability of hole and electronics may reduce, thereby makes inner quantum well deterioration.Therefore, though there is the luminous pattern regulating action, when considering inner quantum well and light extraction efficiency, final efficient may low or increment minimizing.
According to an embodiment, in order to utilize light extraction efficiency that thick Multiple Quantum Well obtains to improve by the luminous pattern regulating action or expectation, can be that (wherein λ represents radiative wavelength to about λ/2n ± Δ with the distance setting between the quantum well, the mean refractive index of the medium that the n representative is provided with between the second electrode lay and luminescent layer, and Δ≤λ/8n).Distance between the trap can be the distance between the trailing edge of the distance between the leading edge of the distance between the center of for example two adjacent traps, two adjacent traps or two adjacent traps, and it is applicable to all embodiments as herein described.
As shown in Figure 2, quantum well can be included in wherein in the layer by the compound generation light in electronics and hole, and for example, light can send from the quantum well in the luminescent layer.
When from the light of luminescent layer with from the light constructive interference in reflector the time, can think the luminous efficiency maximization.Because the reflector is positioned at the position that wherein produces constructive interference with respect to vertical direction, so can produce the light of vertical direction.Therefore, thereby the emission light that initially makes progress and initial emission downwards and the emission light that made progress by mirroring subsequently have identical constructive interference on phase place, light from initial just can so that in vertical direction and/or light on every side have the brightness of increase.
For example, distance between the quantum well of reflector 150 and near reflection layer can be expressed as (2m+1) (λ/4n)-2 α ± Δ), wherein the m representative is greater than zero constant, λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between the second electrode lay and luminescent layer, α represents the depth of penetration of light in the reflector, and Δ≤λ/8n.
When light incided on the reflector, part light can penetrate the surface in reflector.This is called the depth of penetration.Therefore, the displacement of light can increase.For example, emission light can penetrate distance alpha in the reflector.Then, the light by reflective layer reflects penetrates distance alpha once more in the reflector.As a result, the displacement of light can increase total penetrating apart from (2 α).Therefore, the distance between the quantum well of near reflection layer can consider that total penetrating under the distance situation of (2 α) set in the surface in reflector 150 and a plurality of quantum well.
As a result, although provide a plurality of quantum well,, for example when quantum well is separately positioned on apart from reflector 3 λ/4n, 5 λ/4n and 7 λ/4n place, can make the luminous efficiency maximization on (for example vertical) direction of expectation.Herein, the distance between the quantum well can be λ/2n ± Δ.
In this embodiment, the light that produces of the hole by occurring in each quantum well-electron recombination process is by perpendicular polarization.This shows that a plurality of quantum well have the trend identical with single quantum well.That is to say, can under the situation of not sacrificing the initial internal quantum efficiency, obtain the luminous pattern regulating action of perpendicular polarization.Because all quantum well in a plurality of quantum well can participate in having the quantum effect of same phase, so a plurality of quantum well in this embodiment can be called " relevant Multiple Quantum Well ".Yet other embodiment can not have this identical phase place, therefore can use dissimilar quantum well.
Fig. 2 shows the sectional view of an embodiment of the luminescent layer 120 of LED.As shown in the figure, luminescent layer can comprise a plurality of quantum well, and described a plurality of quantum well comprise first quantum well 121, second quantum well 122 and the 3rd quantum well 123.The number of quantum well for example can change according to design specification or expection application.
The reflector 150 of the second electrode lay and the distance between first quantum well 121 in contiguous this reflector can be expressed as (2m+1) (λ/4n) ± Δ.Distance between the quantum well can be identical or different.When the distance between the quantum well was identical, this distance can be expressed as λ/2n ± Δ.
Referring again to Fig. 2, although a plurality of quantum well has a plurality of coherent quantum traps, each quantum well can not have the density or the concentration in identical electronics and hole.For example, because hole mobility is often bigger, at first be filled with the hole so comprise the zone of first quantum well 121 (it is adjacent to second conductive-type semiconductor layer of supplying with the hole).Therefore, in this embodiment, the hole at first quantum well, 121 places and the probability of electron recombination can be maximum.
An embodiment of the method for making the LED that shows among Fig. 1 and 2 will be described now.The initial step of this method is included on first substrate and forms ray structure, and this first substrate is removed subsequently.Perhaps, can on conductive substrates such as the second electrode lay, form ray structure.
On first substrate, form the semiconductor layer 130 of first conductive-type semiconductor layer 110, active layer 120 and second conductivity type that comprise first conductivity type.Between first substrate and semiconductor layer 110, can form unadulterated semiconductor layer.
Ray structure can be the AlGaInN semiconductor layer.Yet, can use different semi-conducting materials.First substrate can be for example sapphire single-crystal substrate, and can implement wet etching process to remove the impurity on first substrate surface.
After this, for example utilize chemical vapor deposition (CVD) technology, molecular beam epitaxy (MBE) technology, sputtering technology or hydride gas-phase epitaxy (HVPE) depositing operation form semiconductor layer 110 on first substrate.In addition, can be with trimethyl gallium gas (TMGa), ammonia (NH
3), nitrogen (N
2) and the silane gas (SiH that comprises silicon (Si) and n type impurity
4) in the flood chamber to form first conductive-type semiconductor layer 110.
After this, on semiconductor layer 110, form active layer 120.Active layer can comprise at least a in Multiple Quantum Well (MQW) structure, quantum wire structure or the quantum-dot structure.According to an embodiment, active layer can have by injecting trimethyl gallium gas (TMGa), ammonia (NH
3), nitrogen (N
2) and the multi-quantum pit structure that forms of trimethyl indium gas (TMIn).Can inject different gas in other embodiments.
And active layer can have one or more kinds in InGaN/GaN structure, InGaN/InGaN structure, AlGaN/GaN structure, InAlGaN/GaN structure, GaAs/AlGaAs (InGaAs) structure or GaP/AlGaP (InGaP) structure.As shown in Figure 2, the active layer that is used as luminescent layer 120 can comprise a plurality of quantum well, for example first quantum well 121, second quantum well 122 and the 3rd quantum well 123.
As noted above, in order in thick a plurality of quantum well, to improve light extraction efficiency by the luminous pattern regulating action, distance between the quantum well can be about λ/2n ± Δ, wherein λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between the second electrode lay and luminescent layer, and Δ≤λ/8n.
According to an embodiment, can utilize potential barrier to regulate distance between a plurality of coherent quantum traps.Can form the extension field, make hole and electronics easily to move in the potential barrier of widening.That is to say, for a plurality of coherent quantum traps, the distance between the trap can by or regulate based on the thickness of potential barrier.According to an embodiment, trap and potential barrier can have the thickness less than several nanometers respectively, but can use different thickness in other embodiments.
Then, on active layer, form second conductive-type semiconductor layer 130.For example, can two (ethyl cyclopentadienyl group) magnesium (EtCp of p type impurity will be contained
2Mg) { Mg (C
2H
5C
5H
4)
2As trimethyl gallium gas (TMGa) gas, ammonia (NH
3), nitrogen (N
2) and the flood chamber of magnesium (Mg) in form second conductive-type semiconductor layer.In other embodiments, can use different technology and/or gas.
The second electrode lay can form on semiconductor layer 130, and can comprise ohm layer 140 and reflector 150 and the adhesive layer of choosing wantonly and one or more kinds in second substrate.
According to an example, second electrode can comprise ohm layer 140.Herein, can repeatedly pile up single metal or metal alloy to improve the efficient that electronics-hole is injected.Ohm layer can still be not limited thereto by at least a formation the among ITO, IZO (In-ZnO), GZO (Ga-ZnO), AZO (Al-ZnO), AGZO (Al-Ga ZnO), IGZO (In-Ga ZnO), IrOx, RuOx, RuOx/ITO, Ni/IrOx/Au, Ni/IrOx/Au/ITO, Ni, Pt, Cr, Ti and the Ag.
The second electrode lay can comprise reflector or adhesive layer.For example, when second electrode 150 comprised the reflector, second electrode can comprise the metal level that contains Al, Ag or contain Al or the metal level of the alloy of Ag.Material such as Al or Ag can reflect the light of active layer place generation effectively to improve the light extraction efficiency of LED.
When from the light of luminescent layer with from the light constructive interference in reflector the time, can make the luminous efficiency maximization.In one embodiment, because reflector 150 is arranged on the position that wherein produces constructive interference with respect to vertical direction, so luminescent layer 120 can produce light in vertical direction.That is to say, from the light of luminescent layer 120 emissions, when the light of initial upwards emission and initial emission downwards and when thereby upwards the light of emission has identical constructive interference on phase place by mirroring subsequently, light from initially just can so that in vertical direction and/or light on every side have the brightness of increase.
For example, the distance between the quantum well of reflector 150 and near reflection layer can be expressed as (2m+1) (λ/4n)-2 α ± Δ).Herein, m is the constant greater than zero, and λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between the second electrode lay and luminescent layer, and α represents the depth of penetration of light in the reflector, and Δ≤λ/8n.
When the light layer reflex time that be reflected, part light can penetrate the surface in reflector.(this is called the depth of penetration.) therefore, the displacement of light can increase.
For example, emission light can penetrate distance alpha in the reflector, then, and can the be reflected layer reflection and in the reflector, penetrate distance alpha once more of described light.As a result, the displacement of light can increase total penetrating apart from (2 α).Therefore, the surface in reflector 150 and the distance between the quantum well in contiguous this reflector can set considering always penetrate under the distance situation of (2 α).
As a result, although provide a plurality of quantum well (for example when quantum well is separately positioned on apart from reflector 3 λ/4n, 5 λ/4n and 7 λ/4n place), can make the luminous efficiency maximization.Herein, the distance between the quantum well can be expressed as λ/2n ± Δ.
For example, under the constructive interference condition, the distance in the reflector 150 of the second electrode lay and a plurality of coherent quantum trap between first quantum well 121 of near reflection layer can be expressed as (2m+1) (λ/4n) ± Δ).
When the second electrode lay 140 comprised the adhesive layer (not shown), the reflector can be used as adhesive layer, and perhaps adhesive layer can utilize Ni or Au to form.Second electrode 150 can comprise the second substrate (not shown).
When first conductive-type semiconductor layer 110 has enough big thickness (for example about 50 μ m), can omit second substrate and form technology.Second substrate can be formed to inject the electron hole effectively by the metal with good electrical conductive properties, metal alloy or conductive semiconductor material.For example, second substrate can be formed by one or more kinds among copper (Cu), Cu alloy, Si, molybdenum (Mo) and the SiGe.Second substrate can utilize the electrochemistry metaliding or utilize the bonding method of eutectic metal to form.
Then, remove first substrate to expose semiconductor layer 110.First substrate can utilize high power laser light to peel off or utilize chemical etching process to remove.In addition, first substrate can remove by physical grinding technology.Remove first substrate to expose semiconductor layer 110 or unadulterated semiconductor layer.Then, on first conductive-type semiconductor layer 110, can form first electrode 160.
Fig. 4 shows the sectional view of an embodiment of LED encapsulation, and described LED encapsulation comprises: body 200, be arranged on third electrode layer 210 and the 4th electrode layer 220 in the body 200, be arranged in the body 200 and the molded element 400 of LED100 that is electrically connected with third electrode layer 210 and the 4th electrode layer 220 and encirclement LED100.Body 200 can be formed by silicon materials, synthetic resin material or metal material, and around the LED100 inclined surface can be set.
In addition, LED can be electrically connected with third electrode layer and/or the 4th electrode layer by lead 300.In this embodiment, because that show in this example is vertical-type LED, thus can use a lead, but in other embodiments, can exist to be connected to LED or from multiple conducting wires and/or a plurality of connector of LED.And for example, for lateral type LED, can use two leads.In addition, when LED comprises flip chip type LED, can not use lead 300.
Except aforementioned feature, can provide molded element 400 to surround and protect LED.In addition, can comprise phosphor in the molded element to change from the LED wavelength of light emitted.The LED encapsulation comprises perhaps can comprise a plurality of LED by at least one LED.
According to an embodiment, a plurality of LED encapsulation can be arranged on the substrate, and can be along the optical path setting of LED encapsulation as light guide plate, the prismatic lens of optical element and the sheet that looses.LED encapsulation, substrate and optical element can be used as the light unit.In other embodiments, display device, indicating device and/or photosystem can form LED or the LED encapsulation that comprises according to embodiment described herein.For example, the illuminator of lamp or street lamp form can comprise the light emitting module with LED encapsulation described herein.
One or more embodiment as herein described provides luminescent device and comprises the luminescent device encapsulation of this luminescent device, and described luminescent device can comprise the light extraction efficiency that the relative thick luminescent layer of a plurality of quantum well structures is improved with utilization by the luminous pattern regulating action.
In one embodiment, a kind of luminescent device (LED) comprises ray structure, described ray structure comprises first conductive-type semiconductor layer, luminescent layer and second conductive-type semiconductor layer, wherein said luminescent layer comprises a plurality of quantum well, distance between the quantum well in described a plurality of quantum well is that (wherein λ represents radiative wavelength to about λ/2n ± Δ, the mean refractive index of the medium that the n representative is provided with between the second electrode lay and luminescent layer, and Δ≤λ/8n.)
In another embodiment, a kind of luminescent device (LED) comprises ray structure, and described ray structure comprises first conductive-type semiconductor layer, comprises the luminescent layer and second conductive-type semiconductor layer of a plurality of quantum well; And the reflector on ray structure, wherein the distance between the quantum well in reflector and the most contiguous institute reflector is corresponding to the constructive interference condition.
In another embodiment, luminescent device (LED) encapsulation comprises that ray structure, described ray structure comprise first conductive-type semiconductor layer, comprise luminescent layer and second conductive-type semiconductor layer and the reflector on described ray structure of a plurality of quantum well; And the packaging body that wherein is provided with described LED, wherein the reflector and the distance between the quantum well in contiguous described reflector corresponding to the constructive interference condition.
According to another embodiment, a kind of luminescent device (LED) comprises ray structure, and described ray structure comprises first conductive-type semiconductor layer, luminescent layer and second conductive-type semiconductor layer; And the reflector that is set to adjacency second conductive-type semiconductor layer, wherein said luminescent layer comprises a plurality of quantum well, distance between the adjacent quantum well is that (wherein λ represents radiative wavelength to about λ/2n ± Δ, the mean refractive index of the medium that the n representative is provided with between reflector and luminescent layer, and Δ≤λ/8n.)
In aforementioned LED, the reflector and the distance between the quantum well in contiguous described reflector be to make by between the light of luminescent layer emission and the light constructive interference taking place by reflective layer reflects.
In aforementioned LED, the reflector and the distance between the quantum well in contiguous described reflector be that (wherein the m representative is greater than zero constant for (2m+1) (λ/4n)-2 α ± Δ), λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between reflector and luminescent layer, α represents the depth of penetration of light in the reflector, and Δ≤λ/8n.)
In another embodiment, a kind of luminescent device (LED) comprises ray structure, and described ray structure has first conductive-type semiconductor layer, comprises the luminescent layer and second conductive-type semiconductor layer of a plurality of quantum well structures; And the reflector on described ray structure.The reflector and the distance between the quantum well in contiguous described reflector be to make by between the light of luminescent layer emission and the light constructive interference taking place by reflective layer reflects.
In aforementioned LED, the reflector and the distance between the quantum well in contiguous described reflector be that (wherein the m representative is greater than zero constant for (2m+1) (λ/4n)-2 α ± Δ), λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between reflector and luminescent layer, α represents the depth of penetration of light in the reflector, and Δ≤λ/8n.)
According to another embodiment, a kind of luminescent device (LED) encapsulation comprises that ray structure, described ray structure comprise first conductive-type semiconductor layer, comprise the luminescent layer and second conductive-type semiconductor layer by a plurality of quantum well of a plurality of trap layers and the formation of a plurality of barrier layer; And the reflector of the described ray structure of adjacency, (wherein λ represents radiative wavelength to the gross thickness of barrier layer that wherein adjoins each other and trap layer for about λ/2n ± Δ, the mean refractive index of the medium that the n representative is provided with between reflector and luminescent layer, and Δ≤λ/8n.)
In aforementioned encapsulation, the reflector and the distance between the trap layer in contiguous described reflector be that (wherein the m representative is greater than zero constant for (2m+1) (λ/4n)-2 α ± Δ), λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between reflector and luminescent layer, α represents the depth of penetration of light in the reflector, and Δ≤λ/8n.)
In the description of embodiment, should be appreciated that when layer (or a film) be called another layer or substrate " on " time, it can be directly on described another layer or substrate, perhaps also can have the intermediate layer.In addition, should be understood that when layer is called at another layer D score that can also can there be one or more intermediate layer in it directly under another layer.In addition, should also be understood that when layer be called two-layer " between " time, it can be described sole layer between two-layer, perhaps also can have one or more intermediate layer.
In previous embodiments, first conductivity type as herein described and second conductivity type can be selected from n type or p type.
" embodiment " mentioned in this specification, " embodiment ", " exemplary " etc. are meant about the described concrete feature of this embodiment, structure or characteristic and are included at least one embodiment of the present invention.This wording that occurs everywhere in specification needn't all be meant identical embodiment.In addition, when describing concrete feature, structure or characteristic, this feature, structure or characteristic are combined also in those skilled in the art's scope with other concrete feature, structure or the characteristic of embodiment in conjunction with any embodiment.
Though described the present invention with reference to some exemplary of the present invention, it should be understood that those skilled in the art can design multiple other modification and embodiment, they are also in the spirit and scope of disclosure principle.More specifically, can in the scope of the disclosure, accompanying drawing and claims, carry out variations and modifications to building block and/or layout that subject combination is arranged.Except building block and/or layout being changed and revise, alternative use also is tangible to those skilled in the art.
Claims (8)
1. a luminescent device (LED) comprising:
Ray structure, described ray structure comprise first conductive-type semiconductor layer, luminescent layer and second conductive-type semiconductor layer; With
Reflector, described reflector are set in abutting connection with described second conductive-type semiconductor layer,
Wherein said luminescent layer comprises a plurality of quantum well, and
Distance between the adjacent quantum well is λ/2n ± Δ, and wherein λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, and Δ≤λ/8n.
2. the described LED of claim 1, wherein said reflector and the distance between the most described quantum well in contiguous described reflector make by between the light of described luminescent layer emission and the light constructive interference taking place by described reflective layer reflects.
3. the described LED of claim 2, wherein said reflector and the distance between the most described quantum well in contiguous described reflector be (2m+1) (λ/4n)-2 α ± Δ), wherein the m representative is greater than zero constant, λ represents described radiative wavelength, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, α represents the depth of penetration of light in described reflector, and Δ≤λ/8n.
4. a luminescent device (LED) comprising:
Ray structure, described ray structure comprise first conductive-type semiconductor layer, comprise the luminescent layer and second conductive-type semiconductor layer of a plurality of quantum well; With
Reflector on described ray structure,
Wherein said reflector and the distance between the most described quantum well in contiguous described reflector make by between the light of described luminescent layer emission and the light constructive interference taking place by described reflective layer reflects.
5. the described LED of claim 4, wherein said reflector and the distance between the most described quantum well in contiguous described reflector be (2m+1) (λ/4n)-2 α ± Δ), wherein the m representative is greater than zero constant, λ represents described radiative wavelength, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, α represents the depth of penetration of light in described reflector, and Δ≤λ/8n.
6. a luminescent device (LED) comprising:
Ray structure, described ray structure comprise first conductive-type semiconductor layer, comprise the luminescent layer and second conductive-type semiconductor layer of a plurality of quantum well that form by a plurality of trap layers and a plurality of barrier layer; And
In abutting connection with the reflector of described ray structure,
The gross thickness of barrier layer that wherein adjoins each other and trap layer is λ/2n ± Δ, and wherein λ represents radiative wavelength, the mean refractive index of the medium that the n representative is provided with between described reflector and described luminescent layer, and Δ≤λ/8n.
7. luminescent device encapsulation comprises the described luminescent device of claim 1, and comprises and be provided as the packaging body that holds described luminescent device.
8. an illuminator comprises light emitting module portion, and described light emitting module portion comprises the described luminescent device encapsulation of claim 7.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020090036984A KR101064011B1 (en) | 2009-04-28 | 2009-04-28 | Light emitting device and manufacturing method |
| KR10-2009-0036984 | 2009-04-28 |
Publications (2)
| Publication Number | Publication Date |
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| CN101877381A true CN101877381A (en) | 2010-11-03 |
| CN101877381B CN101877381B (en) | 2015-07-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010169136.7A Active CN101877381B (en) | 2009-04-28 | 2010-04-28 | Light emitting device and light emitting device package |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20110037050A1 (en) |
| EP (1) | EP2246912A1 (en) |
| KR (1) | KR101064011B1 (en) |
| CN (1) | CN101877381B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103647009A (en) * | 2013-12-11 | 2014-03-19 | 天津三安光电有限公司 | Nitride light emitting diode and manufacturing method thereof |
| CN105161586A (en) * | 2015-09-29 | 2015-12-16 | 山东浪潮华光光电子股份有限公司 | LED epitaxial structure having combination barrier multi-quantum well and preparation method |
| CN106935151A (en) * | 2017-02-28 | 2017-07-07 | 郑清团 | Microscale-nanoscale semiconductor LED display screen of wafer scale and preparation method thereof |
| CN108110100A (en) * | 2016-11-24 | 2018-06-01 | 三星电子株式会社 | Semiconductor light-emitting apparatus and its manufacturing method |
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| US9276380B2 (en) * | 2011-10-02 | 2016-03-01 | Keh-Yung Cheng | Spontaneous and stimulated emission control using quantum-structure lattice arrays |
| US9218965B2 (en) * | 2014-03-28 | 2015-12-22 | National Tsing Hua University | GaN epitaxial growth method |
| JP2020108087A (en) * | 2018-12-28 | 2020-07-09 | セイコーエプソン株式会社 | Vibration device, electronic apparatus, and movable body |
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| US20060054919A1 (en) * | 2004-08-27 | 2006-03-16 | Kyocera Corporation | Light-emitting element, method for manufacturing the same and lighting equipment using the same |
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| CN106935151A (en) * | 2017-02-28 | 2017-07-07 | 郑清团 | Microscale-nanoscale semiconductor LED display screen of wafer scale and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101064011B1 (en) | 2011-09-08 |
| EP2246912A1 (en) | 2010-11-03 |
| KR20100118251A (en) | 2010-11-05 |
| CN101877381B (en) | 2015-07-22 |
| US20110037050A1 (en) | 2011-02-17 |
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